South Pole image from LOLA data |
South Pole image from LOLA data |
Jan 5 2011, 04:39 AM
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#16
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Member Group: Members Posts: 890 Joined: 18-November 08 Member No.: 4489 |
QUOTE I'm getting severe orbit streaking when I create high resolution(~5m) gridded datasets from the RDRs. Has anyone noticed orbit streaks in the 5m resolution GDRs? The heighest point is 2078m the lowest is -2999 m. Orbit streaks are visible but not too bad in this image because it is using a lower resolution dataset (80m). the poles "should" be much better than the mid latitude +45 to -45 Now there is the scientific removal but that will be in a few years .When there is much more data , that can be averaged better. There is also an"Artistic " smoothing without bluing that i used for the 256 px./ deg. full map I made . that involved using a heat flow pde that " G'mic" ( grastoration / Cimg.h ) uses . an example now that is NOT near the pole and thus needs a very BIG correction |
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Jan 6 2011, 06:24 AM
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#17
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Member Group: Members Posts: 890 Joined: 18-November 08 Member No.: 4489 |
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Jan 13 2011, 02:45 PM
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#18
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Junior Member Group: Members Posts: 22 Joined: 20-June 09 Member No.: 4830 |
Current orbits are good to 15-20m, so I am not surprised that the orbit errors show up at 5m resolution. We're working on it (for example, by developping new gravity field models), but 5m is currently not achievable. (For reference, the original requirement was 50m). Maybe after GRAIL gives us a perfect gravity field!
Also, keep in mind that each laser footprint is ~5m in diameter, so your maps will have very sparse coverage at those resolutions. |
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